New, unopened set!! These are such a great gift for little ones :) my kids played with the other set we have for hours!! This set contains ten blocks which will help your child learn to count numbers one through ten, and encourage understanding of early math concepts as the size of the blocks grow with higher numbers. After play, blocks can be nested back into each other by size, another valuable exercise for growing minds and hands. Problem Solving: It takes practice and balance to stack the blocks, developing motor skills. Children must solve that the biggest blocks go on the bottom and the smaller blocks are stacked on top in order to create a tall tower. Motor Skills: After balancing and stacking play, blocks can be nested back into each other by size for neat storage, another valuable exercise for growing minds and hands. Sturdy & Safe For Children & Toddlers: Ethically made with eco-friendly FSC certified paper board and printed with nontoxic soy based ink. Designed with quality materials and made to last. Blocks measure 36 inches tall when fully stacked. Recommended for ages 2+.